Re: [Qemu-devel] [PATCH] ppc/kvm: have the "family" CPU alias to point to TYPE_HOST_POWERPC_CPU

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Jul 05, 2017 at 10:49:52AM +0200, Greg Kurz wrote:
> When running KVM on POWER, we allow the user to pass "-cpu POWERx" instead
> of "-cpu host". This is achieved by patching the ppc_cpu_aliases[] array
> so that "POWERx" points to the CPU class with the same PVR as the host CPU.
> This causes CPUs to be instantiated from this CPU class instead of the
> TYPE_HOST_POWERPC_CPU class which is used with "-cpu host". These CPUs thus
> miss all the KVM specific tuning from kvmppc_host_cpu_class_init().
> 
> This currently causes QEMU with "-cpu POWER9" to fail when running KVM on a
> POWER9 DD1 host:
> 
> qemu-system-ppc64: Register sync failed... If you're using kvm-hv.ko, only
>  "-cpu host" is possible
> kvm_init_vcpu failed: Invalid argument
> 
> Let's have the "POWERx" alias to point to TYPE_HOST_POWERPC_CPU directly,
> so that "-cpu POWERx" instantiates CPUs from the same class as "-cpu host".
> 
> Signed-off-by: Greg Kurz <groug@kaod.org>

Nice.  I had mistakenly thought it already did that.

I've applied this to ppc-for-2.10.

Just to make sure I've understood, this obsoletes Laurent's earlier
patches moving DD1 workarounds about, yes?

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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